Swiss staybrite stainless steel chronograph with register Circa 1925

Stainless steel dress watch with tachymeter and telemeter
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A fine Swiss, staybrite stainless steel keyless dress watch with co axial single-button chronograph, register, tachymeter and telemeter, circa 1925. A polished and brushed case stepped inclined bezel. Three-tone silvered dial with painted Arabic numerals and baton indexes, inner spiral telemetric scale, outer minute track with concentric fifths of a second and telemeter scales, subsidiary seconds at 6 and 30-minute recording dial at 12. Blued steel Breguet hands. A rhodium-plated movement, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Dial signed.
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Diameter: 47 mm
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Signed: Breitling  Swiss
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Staybrite is the name of a steel alloy containing 0.2% carbon, 18% chromium and 8% nickel. It is a stainless material that takes a fine polish and is therefore often used for making watch cases. It is probably the type of stainless steel that has been most widely used by watch companies, from the 1930s onwards.